NestJS class-validator validate array of numbers in form data

Question

How can I handle the validation of an array of numbers in form data? Because I am passing data in a form-data format, I can't validate an array of numbers Actually, I don't know how to do it.

This is my CreatePostDto:

export class CreatePostDto {
  @IsNotEmpty()
  @IsString()
  @MinLength(3)
  title: string;

  @ApiProperty({ type: 'string', format: 'binary' })
  thumbnail: any;

  @IsNotEmpty()
  @IsString()
  @MinLength(20)
  @MaxLength(300)
  description: string;

  @IsNotEmpty()
  @IsString()
  @MinLength(20)
  body: string;

  @IsOptional()
  @Type(() => Number)
  @IsNumberString({}, { each: true })
  tags: number[];

  @IsOptional()
  @Type(() => Number)
  @IsNumberString({}, { each: true })
  categories: number[];

  @IsBooleanString()
  published: boolean;
}

Владислав Слинкин · Accepted Answer · 2021-12-02 12:26:21Z

25

A decision: https://github.com/typestack/class-validator/issues/454

Short answer:

@IsNumber({},{each: true})
numbers: number[];

answered Dec 2, 2021 at 12:26

Владислав Слинкин

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1 Comment

MrIzzat Mar 2 at 11:21

This solves the issue by returning a 400 bad request. But it sends a generic message saying: "each value in must be a number conforming to the specified constraints". Is there a way so that it says that each number must be an number?

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